CN104550926A - Iron-based tungsten carbide powder metallurgy valve material and preparation method thereof - Google Patents
Iron-based tungsten carbide powder metallurgy valve material and preparation method thereof Download PDFInfo
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- CN104550926A CN104550926A CN201410819116.8A CN201410819116A CN104550926A CN 104550926 A CN104550926 A CN 104550926A CN 201410819116 A CN201410819116 A CN 201410819116A CN 104550926 A CN104550926 A CN 104550926A
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Abstract
The invention discloses an iron-based tungsten carbide powder metallurgy valve material. The valve material is prepared from the following raw materials in parts by weight: 2-4 parts of manganese-silicon alloy, 3-3.5 parts of cobalt powder, 1-1.5 parts of sodium borohydride, 0.6-0.9 part of PVP (Polyvinyl Pyrrolidone), 3-5 parts of ethanol, 5-8 parts of tungsten powder, 1.6-1.8 parts of lanthanum oxide, 1.4-1.7 parts of iridium oxide, 23-26 parts of tungsten carbide, 0.3-0.4 part of silane coupling agent kh-550, a proper amount of 1 percent sodium carbonate solution, a proper amount of water, 4-5 parts of sodium hypophosphite, 0.4-0.6 part of polyethylene glycol, 50-60 parts of 2 Mol/L copper sulfate solution, 2-3 parts of wetting aid and 60-64 parts of iron powder. The valve material is uniform in microstructure, and the strength and toughness are enhanced; the tungsten carbide is added, so that the hardness, heat conductivity and current conductivity of a valve are enhanced; the valve material is suitable for making valves for use in high-temperature environments.
Description
Technical field
The present invention relates to powder metallurgical technology, particularly relate to metallurgical valve material of a kind of iron-based tungsten-carbide powder and preparation method thereof.
Background technology
Valve is in fluid system, is used for controlling the device of the direction of fluid, pressure, flow, is the medium in pipe arrangement and equipment (liquid, gas, powder) is flowed or stops and controlling the device of its flow.
Valve material therefor is a lot, and wherein mmaterial manufacture craft is simple, makes precision high, saved cost, but powder metallurgy exists a lot of problem.Such as common iron-base powder metallurgy material is heat-resisting, erosion resistance is poor, and bearing is poor, and the mechanical properties such as intensity, hardness, shock-resistance are not high enough.
Metal has heat-shock resistance, the feature of good toughness, but metal is easily oxidized, and hot strength is not high.Stupalith has high rigidity, good heat resistance, the feature such as corrosion-resistant.By metal and Ceramic bond, can obtain that hardness is large, hot strength is high, high temperature creep is good, the material of good thermal shock, many excellent properties such as anti-oxidant, corrosion-resistant, wear-resistant, make valve be more suitable for the change of environment, longer service life.But due to nonmetallic phase and metallographic phase poor compatibility, easily make composition occur segregation, homogeneity of structure is poor, intensity is uneven, occur piebald, running-in ability is poor, wears no resistance, larger pressure can not be born, heat declines seriously, and cracking resistance can be poor, and thermal fatigue resistance can be poor, reduce use properties, shorten work-ing life.
The performance of iron-base powder metallurgy material can be improved by feed change, the performance of material can also be improved by the consistency improving nonmetallic phase and metallographic phase.
Summary of the invention
The object of the present invention is to provide metallurgical valve material of a kind of iron-based tungsten-carbide powder and preparation method thereof, this valve material homogeneous microstructure, intensity is high, good toughness, thermal conductivity, good conductivity, is applicable to the valve making operation in hot environment.
Technical scheme of the present invention is as follows:
The metallurgical valve material of a kind of iron-based tungsten-carbide powder, is characterized in that being made up of the raw material of following weight part: manganese-silicon 2-4, cobalt powder 3-3.5, sodium borohydride 1-1.5, PVP0.6-0.9, ethanol 3-5, tungsten powder 5-8, lanthanum trioxide 1.6-1.8, iridium oxide 1.4-1.7, wolfram varbide 23-26, silane coupling agent kh-550 0.3-0.4,1% sodium carbonate solution is appropriate, water appropriate, inferior sodium phosphate 4-5, polyoxyethylene glycol 0.4-0.6,2Mol/L copper-bath 50-60, wetting aid 2-3, iron powder 60-64;
Described wetting aid is made up of the raw material of following weight part: SrCl 0.1-0.2, P2O5 0.2-0.4, sodium stannate 0.4-0.6, K
2zrF
62.3-2.8, Mo1.3-1.6, nanometer LA2O3 0.6-0.9, ceria nanopowder 0.3-0.5, nano-sized carbon 0.2-0.4, aluminium powder 0.6-0.9, NaF0.1-0.2, acetone 8-10, poly(oxyethylene glycol) 400 0.1-0.2; Preparation method is: poly(oxyethylene glycol) 400 added in acetone, stir, add nanometer LA2O3, ceria nanopowder again, under 8000-10000 rev/min, stir 10-15 minute, ultrasonic disperse 4-5 minute, then add other remaining components stirring 10-15 minute, ultrasonic disperse 4-5 minute, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1300-1400 DEG C, insulation 20-30 minute, cooling, pulverizes, to obtain final product.
The preparation method of the metallurgical valve material of described iron-based tungsten-carbide powder, is characterized in that comprising the following steps:
(1) by lanthanum trioxide, iridium oxide, wolfram varbide mixing, add in 1% sodium carbonate solution of 3-4 times of weight part, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight part, repeated washing 2-3 time, filter, obtain filter cake;
(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight part, add silane coupling agent kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of cobalt powder, 0.5-0.8 weight part, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) by PVP, ethanol mixing, be stirred to dissolving, the powder obtained with (3) step and other remaining components mix, ball milling, shaping, sintering, finished machined, to obtain final product.
Beneficial effect of the present invention
Valve material manufacture craft of the present invention makes metallographic phase and nonmetallic phase mutually intert, and combines closely, and adds wettability and the cohesiveness of nonmetallic phase and metallographic phase, can prevent component segregation, makes material structure even, adds intensity and toughness; By adding wolfram varbide, adding hardness and thermal conductivity, the electroconductibility of valve, being applicable to the valve making operation in hot environment; The wetting aid of the application of the invention, can increase the wettability of metal pair nonmetallic phase, increases fatigue strength and the toughness of valve.
Embodiment
The metallurgical valve material of a kind of iron-based tungsten-carbide powder, is made up of the raw material of following weight part (kilogram): manganese-silicon 3, cobalt powder 3.3, sodium borohydride 1.3, PVP0.7, ethanol 4, tungsten powder 7, lanthanum trioxide 1.7, iridium oxide 1.6, wolfram varbide 25, silane coupling agent kh-550 0.3,1% sodium carbonate solution are appropriate, water appropriate, inferior sodium phosphate 4.5, polyoxyethylene glycol 0.5,2Mol/L copper-bath 55, wetting aid 2.5, iron powder 62;
Described wetting aid is made up of the raw material of following weight part (kilogram): SrCl 0.1, P2O5 0.3, sodium stannate 0.5, K
2zrF
62.5, Mo1.5, nanometer LA2O3 0.7, ceria nanopowder 0.4, nano-sized carbon 0.3, aluminium powder 0.7, NaF0.1, acetone 9, poly(oxyethylene glycol) 400 0.1; Preparation method is: poly(oxyethylene glycol) 400 added in acetone, stir, add nanometer LA2O3, ceria nanopowder again, stir 13 minutes under 9000 revs/min, ultrasonic disperse 4 minutes, then add other remaining components and stir 14 minutes, ultrasonic disperse 5 minutes, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1350 DEG C, be incubated 25 minutes, cooling, pulverize, to obtain final product.
The preparation method of the metallurgical valve material of described iron-based tungsten-carbide powder, comprises the following steps:
(1) by lanthanum trioxide, iridium oxide, wolfram varbide mixing, add in 1% sodium carbonate solution of 3.5 times of weight parts, be heated to 45 DEG C, stir 13 minutes, filter, add the water washing of 3.5 times of weight parts, repeated washing 3 times, filter, obtain filter cake;
(2) filter cake is mixed with wetting aid, grind 35 minutes, add the water of 4.5 times of weight parts, add silane coupling agent kh-550, stir 13 minutes, be heated to 65 DEG C, then add the iron powder of cobalt powder, 0.7 weight part, stir 35 minutes, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 65 DEG C, stirring reaction 1.5 hours, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) by PVP, ethanol mixing, be stirred to dissolving, the powder obtained with (3) step and other remaining components mix, ball milling, shaping, sintering, finished machined, to obtain final product.
Experimental data:
The hardness HB of this embodiment valve material is 63 after tested, and density is 96.01%, voidage 9.22%, and fracture toughness property is 15.9MPam
1/2, ultimate compression strength is 159MPa, and bending strength is 507MPa.
Claims (2)
1. the metallurgical valve material of iron-based tungsten-carbide powder, is characterized in that being made up of the raw material of following weight part: manganese-silicon 2-4, cobalt powder 3-3.5, sodium borohydride 1-1.5, PVP0.6-0.9, ethanol 3-5, tungsten powder 5-8, lanthanum trioxide 1.6-1.8, iridium oxide 1.4-1.7, wolfram varbide 23-26, silane coupling agent kh-550 0.3-0.4,1% sodium carbonate solution is appropriate, water appropriate, inferior sodium phosphate 4-5, polyoxyethylene glycol 0.4-0.6,2Mol/L copper-bath 50-60, wetting aid 2-3, iron powder 60-64;
Described wetting aid is made up of the raw material of following weight part: SrCl 0.1-0.2, P2O5 0.2-0.4, sodium stannate 0.4-0.6, K
2zrF
62.3-2.8, Mo1.3-1.6, nanometer LA2O3 0.6-0.9, ceria nanopowder 0.3-0.5, nano-sized carbon 0.2-0.4, aluminium powder 0.6-0.9, NaF0.1-0.2, acetone 8-10, poly(oxyethylene glycol) 400 0.1-0.2; Preparation method is: poly(oxyethylene glycol) 400 added in acetone, stir, add nanometer LA2O3, ceria nanopowder again, under 8000-10000 rev/min, stir 10-15 minute, ultrasonic disperse 4-5 minute, then add other remaining components stirring 10-15 minute, ultrasonic disperse 4-5 minute, spraying dry, sends in vacuum high temperature furnace, be evacuated to≤10
-2pa, then pass into argon gas, be heated to 1300-1400 DEG C, insulation 20-30 minute, cooling, pulverizes, to obtain final product.
2. the preparation method of the metallurgical valve material of iron-based tungsten-carbide powder according to claim 1, is characterized in that comprising the following steps:
(1) by lanthanum trioxide, iridium oxide, wolfram varbide mixing, add in 1% sodium carbonate solution of 3-4 times of weight part, be heated to 40-50 DEG C, stir 10-15 minute, filter, add the water washing of 3-4 times of weight part, repeated washing 2-3 time, filter, obtain filter cake;
(2) mixed with wetting aid by filter cake, grinding 30-40 minute, adds the water of 4-5 times of weight part, add silane coupling agent kh-550, stir 10-15 minute, be heated to 60-70 DEG C, then add the iron powder of cobalt powder, 0.5-0.8 weight part, stir 30-40 minute, filter, spraying dry under an atmosphere of hydrogen, pulverize, cross 130 mesh sieves, obtain powder;
(3) powder that (2) step obtains is added in 2Mol/L copper-bath, add polyoxyethylene glycol, inferior sodium phosphate, be heated to 60-70 DEG C, stirring reaction 1-2 hour, filter, be washed with water to neutrality, pass into hot hydrogen and dry, pulverize, obtain powder;
(4) by PVP, ethanol mixing, be stirred to dissolving, the powder obtained with (3) step and other remaining components mix, ball milling, shaping, sintering, finished machined, to obtain final product.
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| CN201410819116.8A CN104550926A (en) | 2014-12-25 | 2014-12-25 | Iron-based tungsten carbide powder metallurgy valve material and preparation method thereof |
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| CN201410819116.8A CN104550926A (en) | 2014-12-25 | 2014-12-25 | Iron-based tungsten carbide powder metallurgy valve material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115058188A (en) * | 2022-06-15 | 2022-09-16 | 远科秦皇岛节能环保科技开发有限公司 | High-hardness and heat-salt-corrosion-resistant composite film and preparation method thereof |
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Application publication date: 20150429 |
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